<template>
  <div :class="prefixCls">
    <CollapseHeader v-bind="props" :prefix-cls="prefixCls" :show="show" @expand="handleExpand">
      <template #title>
        <slot name="title"></slot>
      </template>
      <template #action>
        <slot name="action"></slot>
      </template>
    </CollapseHeader>

    <CollapseTransition :enable="canExpan">
      <Skeleton v-if="loading" :active="loading" />
      <div :class="`${prefixCls}__body`" v-else v-show="show">
        <slot></slot>
      </div>
    </CollapseTransition>
    <div :class="`${prefixCls}__footer`" v-if="$slots.footer">
      <slot name="footer"></slot>
    </div>
  </div>
</template>
<script lang="ts" setup>
  import type { PropType } from "vue";
  import { ref } from "vue";
  import { isNil } from "lodash-es";
  // component
  import { Skeleton } from "ant-design-vue";
  import { CollapseTransition } from "@/components/general/Transition";
  import CollapseHeader from "./CollapseHeader.vue";
  import { triggerWindowResize as windowResize } from "@/utils/event";
  // hook
  import { useTimeoutFn } from "@/hooks/core/UseTimeout";
  import { useDesign } from "@/hooks/web/UseDesign";

  const props = defineProps({
    title: { type: String, default: "" },
    loading: { type: Boolean },
    /**
     *  Can it be expanded
     */
    canExpan: { type: Boolean, default: true },
    /**
     * Warm reminder on the right side of the title
     */
    helpMessage: {
      type: [Array, String] as PropType<string[] | string>,
      default: ""
    },
    /**
     * Whether to trigger window.resize when expanding and contracting,
     * Can adapt to tables and forms, when the form shrinks, the form triggers resize to adapt to the height
     */
    triggerWindowResize: { type: Boolean },
    /**
     * Delayed loading time
     */
    lazyTime: { type: Number, default: 0 }
  });

  const show = ref(true);

  const { prefixCls } = useDesign("collapse-container");

  /**
   * @description: Handling development events
   */
  function handleExpand(val: boolean) {
    show.value = isNil(val) ? !show.value : val;
    if (props.triggerWindowResize) {
      // 200 milliseconds here is because the expansion has animation,
      useTimeoutFn(windowResize, 200);
    }
  }

  defineExpose({
    handleExpand
  });
</script>
<style lang="less">
  @prefix-cls: ~"@{namespace}-collapse-container";

  .@{prefix-cls} {
    background-color: @component-background;
    border-radius: 2px;
    transition: all 0.3s ease-in-out;

    &__header {
      display: flex;
      height: 32px;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid @border-color-light;
    }

    &__body {
      padding-top: 6px;
    }

    &__footer {
      border-top: 1px solid @border-color-light;
    }

    &__action {
      display: flex;
      text-align: right;
      flex: 1;
      align-items: center;
      justify-content: flex-end;
    }
  }
</style>
